A 1-1/8" x 165mm UNC Grade B7 studbolt (stud only, nuts not included).
Studbolts are threaded studs used with a nut on each end, typically to bolt flanged pipe joints. ASTM A193 Grade B7 is a chromium molybdenum alloy steel grade for high temperature and high pressure service, such as flanged joints in petrochemical, oil and gas plants.